Simultaneous strain-temperature measurement using fluorescence from Yb-doped silica fiber

The effect of strain upon both the fluorescence intensity ratio and the flu orescence decay-time-temperature-sensing techniques has been studied using Yb-doped fiber. The measured variation with strain of the former method is consistent with no strain sensitivity, while the latter method demonstrates a linear dependence on strain. A single optical sensor element using both these fluorescence techniques thereby offers an attractive way of providing temperature compensation in a simultaneous strain and temperature monitori ng system. (C) 2000 American Institute of Physics. [S0034-6748(00)00206-9].